/**
  * Move item to given wishlist.
  * Check whether item belongs to one of customer's wishlists
  *
  * @param Mage_Wishlist_Model_Item $item
  * @param Mage_Wishlist_Model_Wishlist $wishlist
  * @param Mage_Wishlist_Model_Resource_Wishlist_Collection $customerWishlists
  * @param int $qty
  * @throws InvalidArgumentException|DomainException
  */
 protected function _moveItem(Mage_Wishlist_Model_Item $item, Mage_Wishlist_Model_Wishlist $wishlist, Mage_Wishlist_Model_Resource_Wishlist_Collection $customerWishlists, $qty = null)
 {
     if (!$item->getId()) {
         throw new InvalidArgumentException();
     }
     if ($item->getWishlistId() == $wishlist->getId()) {
         throw new DomainException(null, 1);
     }
     if (!$customerWishlists->getItemById($item->getWishlistId())) {
         throw new DomainException(null, 2);
     }
     $buyRequest = $item->getBuyRequest();
     if ($qty) {
         $buyRequest->setQty($qty);
     }
     $wishlist->addNewItem($item->getProduct(), $buyRequest);
     $qtyDiff = $item->getQty() - $qty;
     if ($qty && $qtyDiff > 0) {
         $item->setQty($qtyDiff);
         $item->save();
     } else {
         $item->delete();
     }
 }
 /**
  * Retrieve URL to item Product
  *
  * @param  Mage_Wishlist_Model_Item|Mage_Catalog_Model_Product $item
  * @param  array $additional
  * @return string
  */
 public function getProductUrl($item, $additional = array())
 {
     if ($item instanceof Mage_Catalog_Model_Product) {
         $product = $item;
     } else {
         $product = $item->getProduct();
     }
     $buyRequest = $item->getBuyRequest();
     if (is_object($buyRequest)) {
         $config = $buyRequest->getSuperProductConfig();
         if ($config && !empty($config['product_id'])) {
             $product = Mage::getModel('catalog/product')->setStoreId(Mage::app()->getStore()->getStoreId())->load($config['product_id']);
         }
     }
     return parent::getProductUrl($product, $additional);
 }